package com.ouc.common.utils.excel;

import com.alibaba.fastjson2.JSONArray;
import com.alibaba.fastjson2.JSONObject;
import org.apache.poi.hssf.usermodel.HSSFDataValidation;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.usermodel.ClientAnchor.AnchorType;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.ss.util.CellRangeAddressList;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFClientAnchor;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.lang.reflect.Field;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.net.URL;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.Map.Entry;
import java.util.regex.Pattern;

/**
 * Excel导入导出工具类
 * 原文链接（不定时增加新功能）: https://zyqok.blog.csdn.net/article/details/121994504
 *
 * @author sunnyzyq
 * @date 2021/12/17
 */
@SuppressWarnings("unused")
public class ExcelUtils {

  private static final String XLSX = ".xlsx";
  private static final String XLS = ".xls";
  public static final String ROW_MERGE = "row_merge";
  public static final String COLUMN_MERGE = "column_merge";
  private static final String DATE_FORMAT = "yyyy-MM-dd HH:mm:ss";
  private static final String ROW_NUM = "rowNum";
  private static final String ROW_DATA = "rowData";
  private static final String ROW_TIPS = "rowTips";
  private static final int CELL_OTHER = 0;
  private static final int CELL_ROW_MERGE = 1;
  private static final int CELL_COLUMN_MERGE = 2;
  private static final int IMG_HEIGHT = 30;
  private static final int IMG_WIDTH = 30;
  private static final char LEAN_LINE = '/';
  private static final int BYTES_DEFAULT_LENGTH = 10240;
  private static final NumberFormat NUMBER_FORMAT = NumberFormat.getNumberInstance();


  public static <T> List<T> readFile(File file, Class<T> clazz) throws Exception {
    JSONArray array = readFile(file);
    return getBeanList(array, clazz);
  }

  public static <T> List<T> readMultipartFile(MultipartFile mFile, Class<T> clazz) throws Exception {
    JSONArray array = readMultipartFile(mFile);
    return getBeanList(array, clazz);
  }

  public static JSONArray readFile(File file) throws Exception {
    return readExcel(null, file);
  }

  public static JSONArray readMultipartFile(MultipartFile mFile) throws Exception {
    return readExcel(mFile, null);
  }

  public static Map<String, JSONArray> readFileManySheet(File file) throws Exception {
    return readExcelManySheet(null, file);
  }

  public static Map<String, JSONArray> readFileManySheet(MultipartFile file) throws Exception {
    return readExcelManySheet(file, null);
  }

  private static <T> List<T> getBeanList(JSONArray array, Class<T> clazz) throws Exception {
    List<T> list = new ArrayList<>();
    Map<Integer, String> uniqueMap = new HashMap<>(16);
    for (int i = 0; i < array.size(); i++) {
      list.add(getBean(clazz, array.getJSONObject(i), uniqueMap));
    }
    return list;
  }

  /**
   * 获取每个对象的数据
   */
  private static <T> T getBean(Class<T> c, JSONObject obj, Map<Integer, String> uniqueMap) throws Exception {
    T t = c.newInstance();
    Field[] fields = c.getDeclaredFields();
    List<String> errMsgList = new ArrayList<>();
    boolean hasRowTipsField = false;
    StringBuilder uniqueBuilder = new StringBuilder();
    int rowNum = 0;
    for (Field field : fields) {
      // 行号
      if (field.getName().equals(ROW_NUM)) {
        rowNum = obj.getInteger(ROW_NUM);
        field.setAccessible(true);
        field.set(t, rowNum);
        continue;
      }
      // 是否需要设置异常信息
      if (field.getName().equals(ROW_TIPS)) {
        hasRowTipsField = true;
        continue;
      }
      // 原始数据
      if (field.getName().equals(ROW_DATA)) {
        field.setAccessible(true);
        field.set(t, obj.toString());
        continue;
      }
      // 设置对应属性值
      setFieldValue(t, field, obj, uniqueBuilder, errMsgList);
    }
    // 数据唯一性校验
    if (uniqueBuilder.length() > 0) {
      if (uniqueMap.containsValue(uniqueBuilder.toString())) {
        Set<Integer> rowNumKeys = uniqueMap.keySet();
        for (Integer num : rowNumKeys) {
          if (uniqueMap.get(num).equals(uniqueBuilder.toString())) {
            errMsgList.add(String.format("数据唯一性校验失败,(%s)与第%s行重复)", uniqueBuilder, num));
          }
        }
      } else {
        uniqueMap.put(rowNum, uniqueBuilder.toString());
      }
    }
    // 失败处理
    if (errMsgList.isEmpty() && !hasRowTipsField) {
      return t;
    }
    StringBuilder sb = new StringBuilder();
    int size = errMsgList.size();
    for (int i = 0; i < size; i++) {
      if (i == size - 1) {
        sb.append(errMsgList.get(i));
      } else {
        sb.append(errMsgList.get(i)).append(";");
      }
    }
    // 设置错误信息
    for (Field field : fields) {
      if (field.getName().equals(ROW_TIPS)) {
        field.setAccessible(true);
        field.set(t, sb.toString());
      }
    }
    return t;
  }

  private static <T> void setFieldValue(T t, Field field, JSONObject obj, StringBuilder uniqueBuilder, List<String> errMsgList) {
    // 获取 ExcelImport 注解属性
    ExcelImport annotation = field.getAnnotation(ExcelImport.class);
    if (annotation == null) {
      return;
    }
    String cname = annotation.value();
    if (cname.trim().length() == 0) {
      return;
    }
    // 获取具体值
    String val = null;
    if (obj.containsKey(cname)) {
      val = getString(obj.getString(cname));
    }
    if (val == null) {
      return;
    }
    field.setAccessible(true);
    // 判断是否必填
    boolean require = annotation.required();
    if (require && val.isEmpty()) {
      errMsgList.add(String.format("[%s]不能为空", cname));
      return;
    }
    // 数据唯一性获取
    boolean unique = annotation.unique();
    if (unique) {
      if (uniqueBuilder.length() > 0) {
        uniqueBuilder.append("--").append(val);
      } else {
        uniqueBuilder.append(val);
      }
    }
    // 判断是否超过最大长度
    int maxLength = annotation.maxLength();
    if (maxLength > 0 && val.length() > maxLength) {
      errMsgList.add(String.format("[%s]长度不能超过%s个字符(当前%s个字符)", cname, maxLength, val.length()));
    }
    // 判断当前属性是否有映射关系
    LinkedHashMap<String, String> kvMap = getKvMap(annotation.kv());
    if (!kvMap.isEmpty()) {
      boolean isMatch = false;
      for (String key : kvMap.keySet()) {
        if (kvMap.get(key).equals(val)) {
          val = key;
          isMatch = true;
          break;
        }
      }
      if (!isMatch) {
        errMsgList.add(String.format("[%s]的值不正确(当前值为%s)", cname, val));
        return;
      }
    }
    // 其余情况根据类型赋值
    String fieldClassName = field.getType().getSimpleName();
    try {
      if ("String".equalsIgnoreCase(fieldClassName)) {
        field.set(t, val);
      } else if ("boolean".equalsIgnoreCase(fieldClassName)) {
        field.set(t, Boolean.valueOf(val));
      } else if ("int".equalsIgnoreCase(fieldClassName) || "Integer".equals(fieldClassName)) {
        try {
          field.set(t, Integer.valueOf(val));
        } catch (NumberFormatException e) {
          errMsgList.add(String.format("[%s]的值格式不正确(当前值为%s)", cname, val));
        }
      } else if ("double".equalsIgnoreCase(fieldClassName)) {
        field.set(t, Double.valueOf(val));
      } else if ("long".equalsIgnoreCase(fieldClassName)) {
        field.set(t, Long.valueOf(val));
      } else if ("BigDecimal".equalsIgnoreCase(fieldClassName)) {
        field.set(t, new BigDecimal(val));
      } else if ("Date".equalsIgnoreCase(fieldClassName)) {
        try {
          field.set(t, new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(val));
        } catch (Exception e) {
          field.set(t, new SimpleDateFormat("yyyy-MM-dd").parse(val));
        }
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  private static Map<String, JSONArray> readExcelManySheet(MultipartFile mFile, File file) throws IOException {
    Workbook book = getWorkbook(mFile, file);
    if (book == null) {
      return Collections.emptyMap();
    }
    Map<String, JSONArray> map = new LinkedHashMap<>();
    for (int i = 0; i < book.getNumberOfSheets(); i++) {
      Sheet sheet = book.getSheetAt(i);
      JSONArray arr = readSheet(sheet);
      map.put(sheet.getSheetName(), arr);
    }
    book.close();
    return map;
  }

  private static JSONArray readExcel(MultipartFile mFile, File file) throws IOException {
    Workbook book = getWorkbook(mFile, file);
    if (book == null) {
      return new JSONArray();
    }
    JSONArray array = readSheet(book.getSheetAt(0));
    book.close();
    return array;
  }

  private static Workbook getWorkbook(MultipartFile mFile, File file) throws IOException {
    boolean fileNotExist = (file == null || !file.exists());
    if (mFile == null && fileNotExist) {
      return null;
    }
    // 解析表格数据
    InputStream in;
    String fileName;
    if (mFile != null) {
      // 上传文件解析
      in = mFile.getInputStream();
      fileName = getString(mFile.getOriginalFilename()).toLowerCase();
    } else {
      // 本地文件解析
      in = new FileInputStream(file);
      fileName = file.getName().toLowerCase();
    }
    Workbook book;
    if (fileName.endsWith(XLSX)) {
      book = new XSSFWorkbook(in);
    } else if (fileName.endsWith(XLS)) {
      POIFSFileSystem poifsFileSystem = new POIFSFileSystem(in);
      book = new HSSFWorkbook(poifsFileSystem);
    } else {
      return null;
    }
    in.close();
    return book;
  }

  private static JSONArray readSheet(Sheet sheet) {
    // 首行下标
    int rowStart = sheet.getFirstRowNum();
    // 尾行下标
    int rowEnd = sheet.getLastRowNum();
    // 获取表头行
    Row headRow = sheet.getRow(rowStart);
    if (headRow == null) {
      return new JSONArray();
    }
    int cellStart = headRow.getFirstCellNum();
    int cellEnd = headRow.getLastCellNum();
    Map<Integer, String> keyMap = new HashMap<>();
    for (int j = cellStart; j < cellEnd; j++) {
      // 获取表头数据
      String val = getCellValue(headRow.getCell(j));
      if (val != null && val.trim().length() != 0) {
        keyMap.put(j, val);
      }
    }
    // 如果表头没有数据则不进行解析
    if (keyMap.isEmpty()) {
      return (JSONArray) Collections.emptyList();
    }
    // 获取每行JSON对象的值
    JSONArray array = new JSONArray();
    // 如果首行与尾行相同，表明只有一行，返回表头数据
    if (rowStart == rowEnd) {
      JSONObject obj = new JSONObject();
      // 添加行号
      obj.put(ROW_NUM, 1);
      for (int i : keyMap.keySet()) {
        obj.put(keyMap.get(i), "");
      }
      array.add(obj);
      return array;
    }
    for (int i = rowStart + 1; i <= rowEnd; i++) {
      Row eachRow = sheet.getRow(i);
      JSONObject obj = new JSONObject();
      // 添加行号
      obj.put(ROW_NUM, i + 1);
      StringBuilder sb = new StringBuilder();
      for (int k = cellStart; k < cellEnd; k++) {
        if (eachRow != null) {
          String val = getCellValue(eachRow.getCell(k));
          // 所有数据添加到里面，用于判断该行是否为空
          sb.append(val);
          obj.put(keyMap.get(k), val);
        }
      }
      if (sb.length() > 0) {
        array.add(obj);
      }
    }
    return array;
  }

  private static String getCellValue(Cell cell) {
    // 空白或空
    if (cell == null || cell.getCellTypeEnum() == CellType.BLANK) {
      return "";
    }
    // String类型
    if (cell.getCellTypeEnum() == CellType.STRING) {
      String val = cell.getStringCellValue();
      if (val == null || val.trim().length() == 0) {
        return "";
      }
      return val.trim();
    }
    // 数字类型
    if (cell.getCellTypeEnum() == CellType.NUMERIC) {
      String s = cell.getNumericCellValue() + "";
      // 去掉尾巴上的小数点0
      if (Pattern.matches(".*\\.0*", s)) {
        return s.split("\\.")[0];
      } else {
        return s;
      }
    }
    // 布尔值类型
    if (cell.getCellTypeEnum() == CellType.BOOLEAN) {
      return cell.getBooleanCellValue() + "";
    }
    // 错误类型
    return cell.getCellFormula();
  }

  public static <T> void exportTemplate(HttpServletResponse response, String fileName, Class<T> clazz) {
    exportTemplate(response, fileName, fileName, clazz, false);
  }

  public static <T> void exportTemplate(HttpServletResponse response, String fileName, String sheetName,
                                        Class<T> clazz) {
    exportTemplate(response, fileName, sheetName, clazz, false);
  }

  public static <T> void exportTemplate(HttpServletResponse response, String fileName, Class<T> clazz,
                                        boolean isContainExample) {
    exportTemplate(response, fileName, fileName, clazz, isContainExample);
  }

  public static <T> void exportTemplate(HttpServletResponse response, String fileName, String sheetName,
                                        Class<T> clazz, boolean isContainExample) {
    // 获取表头字段
    List<ExcelClassField> headFieldList = getExcelClassFieldList(clazz);
    // 获取表头数据和示例数据
    List<List<Object>> sheetDataList = new ArrayList<>();
    List<Object> headList = new ArrayList<>();
    List<Object> exampleList = new ArrayList<>();
    Map<Integer, List<String>> selectMap = new LinkedHashMap<>();
    for (int i = 0; i < headFieldList.size(); i++) {
      ExcelClassField each = headFieldList.get(i);
      headList.add(each.getName());
      exampleList.add(each.getExample());
      LinkedHashMap<String, String> kvMap = each.getKvMap();
      if (kvMap != null && kvMap.size() > 0) {
        selectMap.put(i, new ArrayList<>(kvMap.values()));
      }
    }
    sheetDataList.add(headList);
    if (isContainExample) {
      sheetDataList.add(exampleList);
    }
    // 导出数据
    export(response, fileName, sheetName, sheetDataList, selectMap);
  }

  private static <T> List<ExcelClassField> getExcelClassFieldList(Class<T> clazz) {
    // 解析所有字段
    Field[] fields = clazz.getDeclaredFields();
    boolean hasExportAnnotation = false;
    Map<Integer, List<ExcelClassField>> map = new LinkedHashMap<>();
    List<Integer> sortList = new ArrayList<>();
    for (Field field : fields) {
      ExcelClassField cf = getExcelClassField(field);
      if (cf.getHasAnnotation() == 1) {
        hasExportAnnotation = true;
      }
      int sort = cf.getSort();
      if (map.containsKey(sort)) {
        map.get(sort).add(cf);
      } else {
        List<ExcelClassField> list = new ArrayList<>();
        list.add(cf);
        sortList.add(sort);
        map.put(sort, list);
      }
    }
    Collections.sort(sortList);
    // 获取表头
    List<ExcelClassField> headFieldList = new ArrayList<>();
    if (hasExportAnnotation) {
      for (Integer sort : sortList) {
        for (ExcelClassField cf : map.get(sort)) {
          if (cf.getHasAnnotation() == 1) {
            headFieldList.add(cf);
          }
        }
      }
    } else {
      headFieldList.addAll(map.get(0));
    }
    return headFieldList;
  }

  private static ExcelClassField getExcelClassField(Field field) {
    ExcelClassField cf = new ExcelClassField();
    String fieldName = field.getName();
    cf.setFieldName(fieldName);
    ExcelExport annotation = field.getAnnotation(ExcelExport.class);
    // 无 ExcelExport 注解情况
    if (annotation == null) {
      cf.setHasAnnotation(0);
      cf.setName(fieldName);
      cf.setSort(0);
      return cf;
    }
    // 有 ExcelExport 注解情况
    cf.setHasAnnotation(1);
    cf.setName(annotation.value());
    String example = getString(annotation.example());
    if (!example.isEmpty()) {
      if (isNumeric(example) && example.length() < 8) {
        cf.setExample(Double.valueOf(example));
      } else {
        cf.setExample(example);
      }
    } else {
      cf.setExample("");
    }
    cf.setSort(annotation.sort());
    // 解析映射
    String kv = getString(annotation.kv());
    cf.setKvMap(getKvMap(kv));
    return cf;
  }

  private static LinkedHashMap<String, String> getKvMap(String kv) {
    LinkedHashMap<String, String> kvMap = new LinkedHashMap<>();
    if (kv.isEmpty()) {
      return kvMap;
    }
    String[] kvs = kv.split(";");
    if (kvs.length == 0) {
      return kvMap;
    }
    for (String each : kvs) {
      String[] eachKv = getString(each).split("-");
      if (eachKv.length != 2) {
        continue;
      }
      String k = eachKv[0];
      String v = eachKv[1];
      if (k.isEmpty() || v.isEmpty()) {
        continue;
      }
      kvMap.put(k, v);
    }
    return kvMap;
  }

  /**
   * 导出表格到本地
   *
   * @param file      本地文件对象
   * @param sheetData 导出数据
   */
  public static void exportFile(File file, List<List<Object>> sheetData) {
    if (file == null) {
      System.out.println("文件创建失败");
      return;
    }
    if (sheetData == null) {
      sheetData = new ArrayList<>();
    }
    Map<String, List<List<Object>>> map = new HashMap<>();
    map.put(file.getName(), sheetData);
    export(null, file, file.getName(), map, null);
  }

  /**
   * 导出表格到本地
   *
   * @param <T>      导出数据类似，和K类型保持一致
   * @param filePath 文件父路径（如：D:/doc/excel/）
   * @param fileName 文件名称（不带尾缀，如：学生表）
   * @param list     导出数据
   * @throws IOException IO异常
   */
  public static <T> File exportFile(String filePath, String fileName, List<T> list) throws IOException {
    File file = getFile(filePath, fileName);
    List<List<Object>> sheetData = getSheetData(list);
    exportFile(file, sheetData);
    return file;
  }

  /**
   * 获取文件
   *
   * @param filePath filePath 文件父路径（如：D:/doc/excel/）
   * @param fileName 文件名称（不带尾缀，如：用户表）
   * @return 本地File文件对象
   */
  private static File getFile(String filePath, String fileName) throws IOException {
    String dirPath = getString(filePath);
    String fileFullPath;
    if (dirPath.isEmpty()) {
      fileFullPath = fileName;
    } else {
      // 判定文件夹是否存在，如果不存在，则级联创建
      File dirFile = new File(dirPath);
      if (!dirFile.exists()) {
        boolean mkdirs = dirFile.mkdirs();
        if (!mkdirs) {
          return null;
        }
      }
      // 获取文件夹全名
      if (dirPath.endsWith(String.valueOf(LEAN_LINE))) {
        fileFullPath = dirPath + fileName + XLSX;
      } else {
        fileFullPath = dirPath + LEAN_LINE + fileName + XLSX;
      }
    }
    System.out.println(fileFullPath);
    File file = new File(fileFullPath);
    if (!file.exists()) {
      boolean result = file.createNewFile();
      if (!result) {
        return null;
      }
    }
    return file;
  }

  private static <T> List<List<Object>> getSheetData(List<T> list) {
    // 获取表头字段
    List<ExcelClassField> excelClassFieldList = getExcelClassFieldList(list.get(0).getClass());
    List<String> headFieldList = new ArrayList<>();
    List<Object> headList = new ArrayList<>();
    Map<String, ExcelClassField> headFieldMap = new HashMap<>();
    for (ExcelClassField each : excelClassFieldList) {
      String fieldName = each.getFieldName();
      headFieldList.add(fieldName);
      headFieldMap.put(fieldName, each);
      headList.add(each.getName());
    }
    // 添加表头名称
    List<List<Object>> sheetDataList = new ArrayList<>();
    sheetDataList.add(headList);
    // 获取表数据
    for (T t : list) {
      Map<String, Object> fieldDataMap = getFieldDataMap(t);
      Set<String> fieldDataKeys = fieldDataMap.keySet();
      List<Object> rowList = new ArrayList<>();
      for (String headField : headFieldList) {
        if (!fieldDataKeys.contains(headField)) {
          continue;
        }
        Object data = fieldDataMap.get(headField);
        if (data == null) {
          rowList.add("");
          continue;
        }
        ExcelClassField cf = headFieldMap.get(headField);
        // 判断是否有映射关系
        LinkedHashMap<String, String> kvMap = cf.getKvMap();
        if (kvMap == null || kvMap.isEmpty()) {
          rowList.add(data);
          continue;
        }
        String val = kvMap.get(data.toString());
        if (isNumeric(val)) {
          rowList.add(Double.valueOf(val));
        } else {
          rowList.add(val);
        }
      }
      sheetDataList.add(rowList);
    }
    return sheetDataList;
  }

  private static <T> Map<String, Object> getFieldDataMap(T t) {
    Map<String, Object> map = new HashMap<>();
    Field[] fields = t.getClass().getDeclaredFields();
    try {
      for (Field field : fields) {
        String fieldName = field.getName();
        field.setAccessible(true);
        Object object = field.get(t);
        map.put(fieldName, object);
      }
    } catch (IllegalArgumentException | IllegalAccessException e) {
      e.printStackTrace();
    }
    return map;
  }

  public static void exportEmpty(HttpServletResponse response, String fileName) {
    List<List<Object>> sheetDataList = new ArrayList<>();
    List<Object> headList = new ArrayList<>();
    headList.add("导出无数据");
    sheetDataList.add(headList);
    export(response, fileName, sheetDataList);
  }

  public static void export(HttpServletResponse response, String fileName, List<List<Object>> sheetDataList) {
    export(response, fileName, fileName, sheetDataList, null);
  }

  public static void exportManySheet(HttpServletResponse response, String fileName, Map<String, List<List<Object>>> sheetMap) {
    export(response, null, fileName, sheetMap, null);
  }


  public static void export(HttpServletResponse response, String fileName, String sheetName,
                            List<List<Object>> sheetDataList) {
    export(response, fileName, sheetName, sheetDataList, null);
  }

  public static void export(HttpServletResponse response, String fileName, String sheetName,
                            List<List<Object>> sheetDataList, Map<Integer, List<String>> selectMap) {

    Map<String, List<List<Object>>> map = new HashMap<>();
    map.put(sheetName, sheetDataList);
    export(response, null, fileName, map, selectMap);
  }

  public static <T, K> void export(HttpServletResponse response, String fileName, List<T> list, Class<K> template) {
    // list 是否为空
    boolean lisIsEmpty = list == null || list.isEmpty();
    // 如果模板数据为空，且导入的数据为空，则导出空文件
    if (template == null && lisIsEmpty) {
      exportEmpty(response, fileName);
      return;
    }
    // 如果 list 数据，则导出模板数据
    if (lisIsEmpty) {
      exportTemplate(response, fileName, template);
      return;
    }
    // 导出数据
    List<List<Object>> sheetDataList = getSheetData(list);
    export(response, fileName, sheetDataList);
  }

  public static void export(HttpServletResponse response, String fileName, List<List<Object>> sheetDataList, Map<Integer, List<String>> selectMap) {
    export(response, fileName, fileName, sheetDataList, selectMap);
  }

  private static void export(HttpServletResponse response, File file, String fileName,
                             Map<String, List<List<Object>>> sheetMap, Map<Integer, List<String>> selectMap) {
    // 整个 Excel 表格 book 对象
    SXSSFWorkbook book = new SXSSFWorkbook();
    // 每个 Sheet 页
    Set<Entry<String, List<List<Object>>>> entries = sheetMap.entrySet();
    for (Entry<String, List<List<Object>>> entry : entries) {
      List<List<Object>> sheetDataList = entry.getValue();
      Sheet sheet = book.createSheet(entry.getKey());
      Drawing<?> patriarch = sheet.createDrawingPatriarch();
      // 设置表头背景色（灰色）
      CellStyle headStyle = book.createCellStyle();
      headStyle.setFillForegroundColor(IndexedColors.GREY_80_PERCENT.index);
      headStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
      headStyle.setAlignment(HorizontalAlignment.CENTER);
      headStyle.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.index);
      // 设置表身背景色（默认色）
      CellStyle rowStyle = book.createCellStyle();
      rowStyle.setAlignment(HorizontalAlignment.CENTER);
      rowStyle.setVerticalAlignment(VerticalAlignment.CENTER);
      // 设置表格列宽度（默认为15个字节）
      sheet.setDefaultColumnWidth(15);
      // 创建合并算法数组
      int rowLength = sheetDataList.size();
      int columnLength = sheetDataList.get(0).size();
      int[][] mergeArray = new int[rowLength][columnLength];
      for (int i = 0; i < sheetDataList.size(); i++) {
        // 每个 Sheet 页中的行数据
        Row row = sheet.createRow(i);
        List<Object> rowList = sheetDataList.get(i);
        for (int j = 0; j < rowList.size(); j++) {
          // 每个行数据中的单元格数据
          Object o = rowList.get(j);
          int v = 0;
          if (o instanceof URL) {
            // 如果要导出图片的话, 链接需要传递 URL 对象
            setCellPicture(book, row, patriarch, i, j, (URL) o);
          } else {
            Cell cell = row.createCell(j);
            if (i == 0) {
              // 第一行为表头行，采用灰色底背景
              v = setCellValue(cell, o, headStyle);
            } else {
              // 其他行为数据行，默认白底色
              v = setCellValue(cell, o, rowStyle);
            }
          }
          mergeArray[i][j] = v;
        }
      }
      // 合并单元格
      mergeCells(sheet, mergeArray);
      // 设置下拉列表
      setSelect(sheet, selectMap);
    }
    // 写数据
    if (response != null) {
      // 前端导出
      try {
        write(response, book, fileName);
      } catch (IOException e) {
        e.printStackTrace();
      }
    } else {
      // 本地导出
      FileOutputStream fos;
      try {
        fos = new FileOutputStream(file);
        ByteArrayOutputStream ops = new ByteArrayOutputStream();
        book.write(ops);
        fos.write(ops.toByteArray());
        fos.close();
      } catch (Exception e) {
        e.printStackTrace();
      }
    }
  }

  /**
   * 合并当前Sheet页的单元格
   *
   * @param sheet      当前 sheet 页
   * @param mergeArray 合并单元格算法
   */
  private static void mergeCells(Sheet sheet, int[][] mergeArray) {
    // 横向合并
    for (int x = 0; x < mergeArray.length; x++) {
      int[] arr = mergeArray[x];
      boolean merge = false;
      int y1 = 0;
      int y2 = 0;
      for (int y = 0; y < arr.length; y++) {
        int value = arr[y];
        if (value == CELL_COLUMN_MERGE) {
          if (!merge) {
            y1 = y;
          }
          y2 = y;
          merge = true;
        } else {
          merge = false;
          if (y1 > 0) {
            sheet.addMergedRegion(new CellRangeAddress(x, x, (y1 - 1), y2));
          }
          y1 = 0;
          y2 = 0;
        }
      }
      if (y1 > 0) {
        sheet.addMergedRegion(new CellRangeAddress(x, x, (y1 - 1), y2));
      }
    }
    // 纵向合并
    int xLen = mergeArray.length;
    int yLen = mergeArray[0].length;
    for (int y = 0; y < yLen; y++) {
      boolean merge = false;
      int x1 = 0;
      int x2 = 0;
      for (int x = 0; x < xLen; x++) {
        int value = mergeArray[x][y];
        if (value == CELL_ROW_MERGE) {
          if (!merge) {
            x1 = x;
          }
          x2 = x;
          merge = true;
        } else {
          merge = false;
          if (x1 > 0) {
            sheet.addMergedRegion(new CellRangeAddress((x1 - 1), x2, y, y));
          }
          x1 = 0;
          x2 = 0;
        }
      }
      if (x1 > 0) {
        sheet.addMergedRegion(new CellRangeAddress((x1 - 1), x2, y, y));
      }
    }
  }

  private static void write(HttpServletResponse response, SXSSFWorkbook book, String fileName) throws IOException {
    response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
    response.setCharacterEncoding("utf-8");
    String name = new String(fileName.getBytes("GBK"), "ISO8859_1") + XLSX;
    response.addHeader("Content-Disposition", "attachment;filename=" + name);
    ServletOutputStream out = response.getOutputStream();
    book.write(out);
    out.flush();
    out.close();
  }

  private static int setCellValue(Cell cell, Object o, CellStyle style) {
    // 设置样式
    cell.setCellStyle(style);
    // 数据为空时
    if (o == null) {
      cell.setCellType(CellType.STRING);
      cell.setCellValue("");
      return CELL_OTHER;
    }
    // 是否为字符串
    if (o instanceof String) {
      String s = o.toString();
      // 当数字类型长度超过8位时，改为字符串类型显示（Excel数字超过一定长度会显示为科学计数法）
      if (isNumeric(s) && s.length() < 8) {
        cell.setCellType(CellType.NUMERIC);
        cell.setCellValue(Double.parseDouble(s));
        return CELL_OTHER;
      } else {
        cell.setCellType(CellType.STRING);
        cell.setCellValue(s);
      }
      if (s.equals(ROW_MERGE)) {
        return CELL_ROW_MERGE;
      } else if (s.equals(COLUMN_MERGE)) {
        return CELL_COLUMN_MERGE;
      } else {
        return CELL_OTHER;
      }
    }
    // 是否为字符串
    if (o instanceof Integer || o instanceof Long || o instanceof Double || o instanceof Float) {
      cell.setCellType(CellType.NUMERIC);
      cell.setCellValue(Double.parseDouble(o.toString()));
      return CELL_OTHER;
    }
    // 是否为Boolean
    if (o instanceof Boolean) {
      cell.setCellType(CellType.BOOLEAN);
      cell.setCellValue((Boolean) o);
      return CELL_OTHER;
    }
    // 如果是BigDecimal，则默认3位小数
    if (o instanceof BigDecimal) {
      cell.setCellType(CellType.NUMERIC);
      cell.setCellValue(((BigDecimal) o).setScale(3, RoundingMode.HALF_UP).doubleValue());
      return CELL_OTHER;
    }
    // 如果是Date数据，则显示格式化数据
    if (o instanceof Date) {
      cell.setCellType(CellType.STRING);
      cell.setCellValue(formatDate((Date) o));
      return CELL_OTHER;
    }
    // 如果是其他，则默认字符串类型
    cell.setCellType(CellType.STRING);
    cell.setCellValue(o.toString());
    return CELL_OTHER;
  }

  private static void setCellPicture(SXSSFWorkbook wb, Row sr, Drawing<?> patriarch, int x, int y, URL url) {
    // 设置图片宽高
    sr.setHeight((short) (IMG_WIDTH * IMG_HEIGHT));
    // （jdk1.7版本try中定义流可自动关闭）
    try (InputStream is = url.openStream(); ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
      byte[] buff = new byte[BYTES_DEFAULT_LENGTH];
      int rc;
      while ((rc = is.read(buff, 0, BYTES_DEFAULT_LENGTH)) > 0) {
        outputStream.write(buff, 0, rc);
      }
      // 设置图片位置
      XSSFClientAnchor anchor = new XSSFClientAnchor(0, 0, 0, 0, y, x, y + 1, x + 1);
      // 设置这个，图片会自动填满单元格的长宽
      anchor.setAnchorType(AnchorType.MOVE_AND_RESIZE);
      patriarch.createPicture(anchor, wb.addPicture(outputStream.toByteArray(), HSSFWorkbook.PICTURE_TYPE_JPEG));
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  private static String formatDate(Date date) {
    if (date == null) {
      return "";
    }
    SimpleDateFormat format = new SimpleDateFormat(DATE_FORMAT);
    return format.format(date);
  }

  private static void setSelect(Sheet sheet, Map<Integer, List<String>> selectMap) {
    if (selectMap == null || selectMap.isEmpty()) {
      return;
    }
    Set<Entry<Integer, List<String>>> entrySet = selectMap.entrySet();
    for (Entry<Integer, List<String>> entry : entrySet) {
      int y = entry.getKey();
      List<String> list = entry.getValue();
      if (list == null || list.isEmpty()) {
        continue;
      }
      String[] arr = new String[list.size()];
      for (int i = 0; i < list.size(); i++) {
        arr[i] = list.get(i);
      }
      DataValidationHelper helper = sheet.getDataValidationHelper();
      CellRangeAddressList addressList = new CellRangeAddressList(1, 65000, y, y);
      DataValidationConstraint dvc = helper.createExplicitListConstraint(arr);
      DataValidation dv = helper.createValidation(dvc, addressList);
      if (dv instanceof HSSFDataValidation) {
        dv.setSuppressDropDownArrow(false);
      } else {
        dv.setSuppressDropDownArrow(true);
        dv.setShowErrorBox(true);
      }
      sheet.addValidationData(dv);
    }
  }

  private static boolean isNumeric(String str) {
    if (Objects.nonNull(str) && "0.0".equals(str)) {
      return true;
    }
    for (int i = str.length(); --i >= 0; ) {
      if (!Character.isDigit(str.charAt(i))) {
        return false;
      }
    }
    return true;
  }

  private static String getString(String s) {
    if (s == null) {
      return "";
    }
    if (s.isEmpty()) {
      return s;
    }
    return s.trim();
  }

}